shelter dogs turned into champions, rescuing others. ABC's Steve osunsami with the dogs who prove a second chance can produce a first-rate hero. They and their trainers are "America strong." Reporter: The police dogs working the beat across America are usually pure breds from Europe that cost tens of thousands of dollars. But trainer brad craw says police can get the same work for next to nothing if they just train the countless future canines on doggy death row in shelters here. This year, he and his mostly military-trained staff have rescued 60 dogs from shelters across the south. All they need is a chance to prove themselves. And these dogs will work every bit as hard as the pure bred dogs we bring in from overseas. Good girl! Reporter: They train them in drug detection an other work and then deliver the canines to local police departments for free. Come on, buddy. Reporter: Today, they have 15 dogs in their eight-week class and 5-month-old Sadie is their star student. This is what she looked like the day animal control picked her up. Are these guys saving dogs? They are. Especially at high kill shelters. Reporter: We met Sadie in the crazy heat and hid of bag of drugs. Watch her sniff it out in seconds. Yes, yes, yes, it's in there. That's a good girl! That reward her with her favorite toy. That's how we teach her to find the drugs. Because she wants to work to get that ball back. Reporter: And they're not just joining police work. They're joining police families, like Wes's, south of Kansas. Her second chance is here. Reporter: Take a look at all these graduates working today. Brad croft and universal canines saved them all. And for that, you are "America strong." Steve osunsami, ABC news, San Antonio. And we thank brad for writing us a letter about his dogs.

This transcript has been automatically generated and may not be 100% accurate.

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